Welcome to Allergy and Immunology

Dr. Dan Atkins

Our Allergy and Immunology Center is one of the largest of its kind, featuring more clinic rooms and food/drug challenge space than any facility in the region. The Center is dedicated solely to the management of pediatric patients with allergic and immunologic diseases.


Dan Atkins

Dan Atkins, MD, a graduate of the University of Texas Medical School, completed his Pediatrics residency and a fellowship in Ambulatory Pediatrics with the University of Texas at Houston/Memorial Hermann Hospital Program. His first Allergy and Immunology fellowship was with the University of Buffalo/Children’s Hospital of Buffalo and his second with the National Institute of Allergy and Infectious Diseases, National Institutes of Health. A Department of Pediatrics faculty member since 1994, Atkins served concurrently at National Jewish Medical and Research Center and the University of Colorado through 2014. He was named Gastrointestinal Eosinophilic Diseases Program co-director at The Children’s Hospital in 2007 and served as Section Head of Allergy and Immunology from 2014–2018.

David Fleischer

David Fleischer, MD, is a graduate of Emory University School of Medicine. He completed his Pediatrics residency and Pediatric Allergy and Immunology fellowship at the Johns Hopkins University School of Medicine program. As Section Head of Allergy and Immunology since 2018, he guided development and now directs the Allergy and Immunology Center at Children’s Hospital Colorado, site of one of the world’s largest food challenge and research programs.